Robert Downey Jr. has long been one of Hollywood's cautionary tales about the perils of drug use — until he became one of its success stories for kicking the habit. Now his oldest son Indio has been arrested on suspicion of possession of a controlled substance believed to be cocaine.

Indio Downey, 20, was arrested Sunday afternoon after a Los Angeles County deputy spotted him in a car smoking something out of a pipe, the Los Angeles Times reports. He was released Sunday night on $10,250 bail, and must return to court Aug. 29.

"Unfortunately there's a genetic component to addiction and Indio has likely inherited it," Downey says in a statement to TMZ. "Also, there is a lot of family support and understanding, and we’re all determined to rally behind him and help him become the man he's capable of being. We’re grateful to the Sheriff’s department for their intervention, and believe Indio can be another recovery success story instead of a cautionary tale."

Indio's mother is Deborah Falconer, who married Downey in 1992, a few years before Downey's drug problems became public with a series of arrests, including an infamous 1996 incident in which he walked into a Malibu home and took a nap in a child's bed. After flunking rehab and violating probation, he served two stints in prison, relapsed but finally got sober in 2003, by which point Falconer had left Downey.

Downey's career — which suffered, but never as much as other actors handicapped by addiction — rebounded with the hugely popular "Iron Man" series. He also married producer Susan Levin and welcomed another son, Exton, in 2012.